1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package utils
import (
"encoding/json"
"fmt"
"strings"
"github.com/codegangsta/cli"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/rpc"
)
// NewInProcRPCClient will start a new RPC server for the given node and returns a client to interact with it.
func NewInProcRPCClient(stack *node.Node) *inProcClient {
server := rpc.NewServer()
offered := stack.APIs()
for _, api := range offered {
server.RegisterName(api.Namespace, api.Service)
}
web3 := node.NewPublicWeb3API(stack)
server.RegisterName("web3", web3)
var ethereum *eth.Ethereum
if err := stack.Service(ðereum); err == nil {
net := eth.NewPublicNetAPI(stack.Server(), ethereum.NetVersion())
server.RegisterName("net", net)
} else {
glog.V(logger.Warn).Infof("%v\n", err)
}
buf := &buf{
requests: make(chan []byte),
responses: make(chan []byte),
}
client := &inProcClient{
server: server,
buf: buf,
}
go func() {
server.ServeCodec(rpc.NewJSONCodec(client.buf))
}()
return client
}
// buf represents the connection between the RPC server and console
type buf struct {
readBuf []byte // store remaining request bytes after a partial read
requests chan []byte // list with raw serialized requests
responses chan []byte // list with raw serialized responses
}
// will read the next request in json format
func (b *buf) Read(p []byte) (int, error) {
// last read didn't read entire request, return remaining bytes
if len(b.readBuf) > 0 {
n := copy(p, b.readBuf)
if n < len(b.readBuf) {
b.readBuf = b.readBuf[:n]
} else {
b.readBuf = b.readBuf[:0]
}
return n, nil
}
// read next request
req := <-b.requests
n := copy(p, req)
if n < len(req) {
// buf too small, store remaining chunk for next read
b.readBuf = req[n:]
}
return n, nil
}
// Write send the given buffer to the backend
func (b *buf) Write(p []byte) (n int, err error) {
b.responses <- p
return len(p), nil
}
// Close cleans up obtained resources.
func (b *buf) Close() error {
close(b.requests)
close(b.responses)
return nil
}
// inProcClient starts a RPC server and uses buf to communicate with it.
type inProcClient struct {
server *rpc.Server
buf *buf
}
// Close will stop the RPC server
func (c *inProcClient) Close() {
c.server.Stop()
}
// Send a msg to the endpoint
func (c *inProcClient) Send(msg interface{}) error {
d, err := json.Marshal(msg)
if err != nil {
return err
}
c.buf.requests <- d
return nil
}
// Recv reads a message and tries to parse it into the given msg
func (c *inProcClient) Recv(msg interface{}) error {
data := <-c.buf.responses
return json.Unmarshal(data, &msg)
}
// Returns the collection of modules the RPC server offers.
func (c *inProcClient) SupportedModules() (map[string]string, error) {
return rpc.SupportedModules(c)
}
// NewRemoteRPCClient returns a RPC client which connects to a running geth instance.
// Depending on the given context this can either be a IPC or a HTTP client.
func NewRemoteRPCClient(ctx *cli.Context) (rpc.Client, error) {
if ctx.Args().Present() {
endpoint := ctx.Args().First()
return NewRemoteRPCClientFromString(endpoint)
}
// use IPC by default
return rpc.NewIPCClient(node.DefaultIpcEndpoint())
}
// NewRemoteRPCClientFromString returns a RPC client which connects to the given
// endpoint. It must start with either `ipc:` or `rpc:` (HTTP).
func NewRemoteRPCClientFromString(endpoint string) (rpc.Client, error) {
if strings.HasPrefix(endpoint, "ipc:") {
return rpc.NewIPCClient(endpoint[4:])
}
if strings.HasPrefix(endpoint, "rpc:") {
return rpc.NewHTTPClient(endpoint[4:])
}
if strings.HasPrefix(endpoint, "http://") {
return rpc.NewHTTPClient(endpoint)
}
if strings.HasPrefix(endpoint, "ws:") {
return rpc.NewWSClient(endpoint)
}
return nil, fmt.Errorf("invalid endpoint")
}
|
